Replacement hot water cylinder

[Numpty 1 million]

Apologies if this question has been posted before, I did try searching...

Need a replacement hot water cylinder. Replacing a 1970s copper one. I believe I need an indirect vented cylinder with no coil inside. Set up is similar to any indirect system but hot is heated from an old AGA, no pumps/CH/electric currently attached. My basic understanding is that I should be wary of (the current) standard cylinders with a coil as they suit pumped systems.

Anyone got some suggestions as to what I should buy or be searching for?

Looking for about 120 L, Water in/out is 18mm and AGA in/out is 28mm.

Looking for the simplest solution. If I haven't explained things well please ask for further info.

Thanks A.

 

[Dan Robinson]

Indirect means it has a coil.

 

[Numpty 1 million]

OK, the current/old one doesn't have a coil but the plumbing set up is the same as an indirect system. Any suggestions?

 

[Dan Robinson]

Unless you have a Primatic system, you have a coil.

 

[Numpty 1 million]

There is no coil. I can stick my finger through the holes and feel the inside of the cylinder in all directions. Does this mean I have a Primatic system and if so how certain are you about that or should I await a second or third opinion. Not saying you are wrong (I don't know) just asking...

 

[Dan Robinson]

How many cisterns in the loft?

 

[polesapart]

You'll need a cylinder with a gravity coil. Newark cylinders are good for bespoke.

This is based on the answer to Dan's question being two, one big one small.

 

[Numpty 1 million]

3 water tanks in the loft, all connected and act as one. 'Overflow/vent' pipe from top of cylinder goes into top of one of the tanks in a classic 'indirect vented' way. Tanks/system supply hot and cold water throughout house, only other cold comes from kitchen tap that comes direct from mains.

 

[Numpty 1 million]

I should add that the installer of the system wasn't known for his expertise rather how to do things on the cheap!

 

[Elastomeric]

If there is no coil in it, how is the water getting heated ?

I habe a Rayburn doing mine, small tank to feed the heating circuit, through the coil in the tank.

 

[Dan Robinson]

This is a primatic. Few and far between now.

Thankfully .

 

[Numpty 1 million]

If there is no coil in it, how is the water getting heated ?


I don't know but assume by hot and cold mixing naturally - all I know is that there isn't a coil unless it is of a really strange construction.

 

[Numpty 1 million]

View attachment 118924

This is a primatic. Few and far between now.

Thankfully .

Would I be able to tell whether the system was primatic or not by feeling inside? From what I feel the inlet pipe goes in and that is that, shining a torch through the hole appears to confirm that. The AGA output is close to the top of the cylinder (but still on the side). Beginning to look like I do need a gravity coil which means bespoke

 

[Nige F]

3 water tanks in the loft, all connected and act as one. 'Overflow/vent' pipe from top of cylinder goes into top of one of the tanks in a classic 'indirect vented' way. .

That's a classic Direct way because the tanks "act as one" Perhaps a picture of the connections to the hot water cylinder will give us a clue,

 

[Numpty 1 million]

That's a classic Direct way because the tanks "act as one" Perhaps a picture of the connections to the hot water cylinder will give us a clue,

Just move the top outlet from the AGA/Boiler to the very top of the vertical side of the cylinder in the diagram above about Primatic systems and that is what I have - ignore internal cylinder stuff.